R in a Nutshell and missing data in R

How well does 'R in a Nutshell' cover missing data?
I'm somebody who knows the basics of R, and is trying to use it on real data,
where there are things like missing values. I've just found out that running a lm
on a data frame with missing values results in residual and coefficient vectors with different lengths than the number of rows in the data frame, and spent a day thrashing around helplessly. I'd to avoid wasting time in the future.
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